Web controlling mechanism



Dec. 26, 1933.

H. FANKBONER WEB coNTRoLLNG MECHANISM 2 sheets-sheet 1 Filed oct. so.1931 mnnnnunnl-Mnr! NVENTOR Dec. 26, 19.33.

. H. FANKBNER WEB CONTROLLING MECHANISM Filed Oct. 50, 1931 \2Sheets-Sheet 2 :j ATTORQY which the straps engaging Patented Dec. 26,1933 UNITED STA Application October 30,

The present invention ling means and more particularly to improved webtensioning mechanism high speed rotary printing presses.

1,940,852 WEB CONTROLLING MECHANISM Harland Fankboner, Chicago, Ill.

1931. serial No. 572,026

'l Claims. (Cl. 2424-75) relates to web controla novel and for use withObjects and advantages of the invention will be set forth in parthereinafter and be obvious herefrom, or may tice with the invention, andattained by means of and combinations pointed out in the claims.

in part will be learned by practhe same being realized theinstrumentalities appended The invention consists in the novel parts,constructions,

arrangements, combinations and improvements herein shown and described.

The accompanying drawings, referred to herein and constituting a parthereof, illustrate one embodiment of the invention, the description,serve to the invention.

Of the drawings:-

Figure 1 is a side elevation of a and together with explain theprinciples of mechanism constituting the present preferred andillustrative embodiment of the invention; and

Figure 2 is a vertical section taken 2-2 of Figure 1.

on the line The present invention has for its object the provision of aweb tensioning mechanism which will operate satisfactorily with unevenor out-ofround web rolls.

Another object is the provision of a web tensioning mechanism employinga plurality of friction members in engagement with the periphery of theweb roll, and having means for maintaining equal the pressurebetween'the friction members and the web roll. Still another object isthe provision of a tension mechanism in the periphery of the web rollare so interconnected that movement of any one strap is transmitted toequalize the pressure of all the straps roll.

Referring now in the others to against the detail to the presentpreferred and illustrative embodiment of the invention, the web rollI 1,

from which the web 2 is fed to the printing press, is rotatablysupported by means of web roll shaft 3 journalled in suitable bearings 4formed in web roll supporting brackets 5 at either side of the web roll.

be conveniently formed Brackets 5 may as an integral part of the sideframes-6 of the printing press, although any other desired or suitableform of web roll supporting means may be employed.

For tensioning the web, there are provided a plurality of frictionmembers yieldingly pressed into engagement with the periphery rollacross its width, said friction me of the web mbers serving Ato restrainthe rotation of the web roll. As

embodied, these friction members comprise flexible straps 7, attachedrollers 8 slidably keyed lower ends are attached in a manner later `tobe at their upper ends to to a shaft 9, while their 6o described. Meansare provided for pressing the straps .against the surface of the webroll with a substantially uniform,

but variable, pressure, and

for taking up slack in the straps as the web roll wears down; For thisrotatably journalled in 10, rigidly attached to a side frames 6. At onepurpose, the shaft 9 is the lower ends of arms shaft 1l journalled inthe end shaft 11 is provided with a laterally projecting threaded arm 12on which is mounted a correspondingly threaded 7 weight 13, tending toshaft l1.

rotate the arms At one end, shaft 9 is provided with a 10 and theirpinion 14 meshing with a segmental rack 15 fixed to the inner side ofone side frame 6, so that movement of arms 10 by weight 13 rotates theshaft 9 and rollers 8 to take up the slack in the straps and maintainthem in contact with the surface of the web roll. the web may be variedThe normal tension of by movement of weightv 13 on threaded arm 12, andas Weight 13 is moved outwardly, the pressure between the belts '7 andthe web roll is increased, thereby increasing the tension on the we`Means are provided for rendering the pressure of all the straps againsttimes,` thereby preventing the web roll equal at all the exertion ofexcessive pressure between any belt and the web roll due to unevennessin pose, the lower end of each strap is provided .a pulley l'lv attachedthereto. Below the web the rolls. For this .pur-

and extending substantially parallel to its axis,

is a transverse rod 18, side frames 6, with collars 19 and 20.

and provided rigidly supported in the along its length Collars 20,` nearthe ends of the roll, are provided with eyes 21 and freely 95 rotatableguiding pulley s 22 while the inner collars 19 are provided with pairsof spaced pulleys 22.-A A flexible cable 23 to eyes 21, at either enlooped over pulleys leys 22.

As collars 20 rod 18 and rollers 8 with respect to the web,

tioned as desired across roll. 'When properly p is attached at its endsd of the web roll and is 17 between the guiding pul- 190 are slidablealong the supporting are movable transversely the strap 7 may be posi:-

the width of the web ositioned collars 20 are rmly secured in positionby set screws 24.

In operation, the straps '7 are normally pressed into engagement withthe surface of the web roll,

and maintained in eng agement therewith with an uneven or out-of-roundweb roll is mounted inweb feeding position, the high parts of the weblroll tend to increase the tension on one or more of the straps, as thehigh part of the roll moves the straps out of their normal position. Anymovement of one strap causes the corresponding loop in cable 23 to beenlarged shortening the remaining loops and thereby reducing thepressure between the rst strap and the roll and transmitting a portionof this pressure to the remaining straps. This action prevents thebuilding up of excessive pressure between any one strap and the web rolldistributing the additional pressure over all of the straps so that onlya rslight and unobjectionable increasein pressure is created, preventingan abnormal and excessive increase in the tension of the web. Similarly,in case one of the straps stretches to a greater extent than theremainder the pressure of all remains equal and no individual adjustmentof the straps is necessary as their pressure is always equalized.

The invention in its broader aspects is not limited to the speciiicmechanisms shown and described but departures may be made therefromwithin the scope of the accompanying claims without departing from theprinciples of the invention and without sacrificing its Achiefadvantages.

What I claim is:

l. Web controlling mechanism including in combination means forrotatably supporting a web roll, a plurality of friction straps pressedinto engagement with the periphery of the web roll to tension the webdrawn therefrom and means interconnecting said straps for equalizingtheir pressure against the roll.

2. Web controlling mechanism including in combination means forrotatably supporting a web roll, a plurality of friction straps engagingthe periphery of the web roll, means for pressing the straps against theweb roll with a uniform tension as the web roll wears down, andinterconnecting means between the straps and a stationary support forequalizing the pressure between them.

3. Web controlling mechanism including in combination means forrotatably supporting a web roll, a plurality of friction membersyieldingly pressed into engagement with the periphery of the web rolland means interconnecting said members for equalizing their pressureagainst the roll.

4. Web controlling mechanism including in combination means forrotatably supporting a web roll, a plurality of friction straps pressedinto engagement with the periphery of the web roll to tension the webdrawn therefrom, a common support to which the straps are attached atone end, a transverse member extending across the width of the web roll,a cable attached to the member to provide loops adjacent the other endof each strap and means for movably connecting each strap to itscorresponding loop.

5. Web controlling mechanism including in combination means forrotatably supporting a web roll, a plurality of friction straps pressedinto engagement with the periphery of the web roll to tension the webdrawn therefrom, a common support to which the straps are attached atone end, a transverse member extending across the Width ofthe web roll,a cable having both its ends attached to said member, guides on saidmember between each pair of straps, and means for movably attaching theother end of each strap to the cable between the guides.

6. Web controlling mechanism including in combination means forrotatably supporting a Web roll, a plurality of friction straps pressedinto engagement with the periphery of the web roll to Vtension the webdrawn therefrom, a common support to which the straps are attached atone end, a transverse member extending across the width of the web roll,a cable having both its ends attached to said member, guides on saidmember between each pair of straps, pulleys on the other end of eachstrap around which the cable is passed between said guides.

7. Web controlling mechanism including in combination means forrotatably supporting a web roll, a plurality of friction straps pressedinto engagement with the periphery of the web roll to tension the webdrawn therefrom, a common support to which the straps are attached atone end, a transverse member extending across the Width of the web roll,a cable having both its ends attached to said members, guide pulleys onsaid member between each pair of straps, a pulley on the other end ofeach strap and around which the cable is passed between its adjacentguides.

HARLAND FANKBONER.

